अव्ययाश्चादयो निपाताः ॥ कZ_०२.१०.१९ ॥
avyayāś cādayo nipātāḥ
Las partículas (nipātas)—como ca («y»), etc.—son indeclinables (avyayas).
Because connectors and particles govern scope (addition, contrast, condition), which is critical for interpreting rules, exemptions, and multi-step procedures.